Stuart G. Yates 
Interlopers From Hell [EPUB ebook] 

There’s something wrong about Edwin, the new kid at school. After Richard befriends him, strange things begin to happen.
When Edwin disappears, Richard starts digging into the history of the family, and unearths something that should have been left buried.
Can Richard figure out the mystery in time, or will a sinister, dark force from the past claim everyone he holds dear?